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EET 110 - Survey of ElectronicsChapter 24 - Residential Branch
Circuit Wiring
NEC Branch circuit requirements
all parts of a circuit that lie beyond the overcurrent device up to the last outlet.
A max of 12 outlets per branch practical limit 8 - 10
A separate duplex must be installed in laundry or utility area.
A duplex at least every 6 feet
NEC Branch circuit requirements
A duplex with GFI protection must be installed at counter height in bathroom/washroom
outdoor at least one one GFI circuit
garage at least one duplex
NEC Branch circuit requirements
Kitchen at least 2 - 20A circuits for appliances. No point on counter more than 24 inches from
outlet split receptacle outlet - 2 hot circuits 50 A, 120V/240V for range
NEC Branch circuit requirements
Color code neutral wire White or neutral gray hot wire black or red ground wire bare or green
pull-chain lamp with duplex receptacle
from a single fuse connection to device to neutral bus
pull-chain lamp with duplex receptacle
switch with lampholder
switch with lampholder
two lamps with a single switch
lamps run in parallel all devices for household wiring are built for
120 volt
Wiring Diagrams
Note that the wiring diagram illustrates the connections that should be made
It differs from the schematic for the same circuit
SThe wiring diagram for two lights in series w/ switch
The schematic for this circuit
Shows the lamps in parallel.
Layout plan
Planning the electrical system requires laying out the physical devices in the floor plan.
Electrical connection to meet NEC rules and to identify switched circuits follows.
Wiring
wiring is in parallelnote each combination of wiring circuittypical layout plantypical wiring diagram
box placement
switch boxes from 44 to 48 inches from floor (bottom of box)
receptacle boxes from 12 to 18 inches from floor.
maximum number of wires allowed in boxes depend on size and number see table 24-2
Assignment
Review questions 1-15 page 333Read Chapter 26, 27, 29